CN114362146B - Multi-region coordinated automatic off-network control strategy and device - Google Patents
Multi-region coordinated automatic off-network control strategy and device Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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Abstract
The invention discloses an automatic off-network control strategy and device with multi-region coordination, wherein the control strategy comprises the following steps: step S1, dividing the virtual power plants in each area into different load shedding rounds; step S2, each virtual power plant monitors the voltage fundamental frequency of the setting point in real time through a low-frequency off-grid device, and obtains the fundamental frequency deviation amount of the current moment of the setting point according to the monitored voltage fundamental frequency of the setting point; and S3, restraining the action behavior classification of each virtual power plant according to fundamental frequency deviation obtained by each virtual power plant and the wheel sequence of each virtual power plant.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an automatic off-grid control strategy and device with multi-region coordination.
Background
With the gradual increase of the access proportion of new energy, the randomness and fluctuation of the new energy provide new challenges for the safe and stable operation of the power system, especially the problem of frequency stability.
The processing means of the existing power system for solving the problem of frequency reduction caused by power shortage mainly comprises an automatic adjustment control device such as primary and secondary frequency modulation, direct current FLC (Frequency Limit Controller, frequency limiter) and the like, a stable control load shedding device, a low-frequency load shedding device and the like to enable the frequency to rise. After large-scale new energy is accessed, the uncertainty of the new energy possibly has the conditions of insufficient standby or insufficient prevention and control of a stability control strategy, so that the problem of low system frequency is caused, and the interruptible load in the virtual power plant has the capacity of rapidly participating in frequency modulation, but has the characteristics of itself, if frequent actions are not expected, how to coordinate each virtual power plant to effectively participate in frequency modulation, benefits are earned, and meanwhile, frequent actions are avoided, so that the normal work of the virtual power plant is influenced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an automatic off-grid control strategy and device with multi-region coordination so as to effectively solve the problems of low-frequency suspension caused by insufficient standby and insufficient control and control stability of a stability control strategy possibly existing after large-scale new energy is accessed.
In order to achieve the above objective, the present invention provides an automatic off-line control strategy with multi-zone coordination, comprising the following steps:
step S1, dividing the virtual power plants in each area into different load shedding rounds;
step S2, each virtual power plant monitors the voltage fundamental frequency of the setting point in real time through a low-frequency off-grid device, and obtains the fundamental frequency deviation amount of the current moment of the setting point according to the monitored voltage fundamental frequency of the setting point;
and S3, restraining the action behavior classification of each virtual power plant according to fundamental frequency deviation obtained by each virtual power plant and the wheel sequence of each virtual power plant.
Preferably, in step S1, the virtual power plants in each region are divided into different load shedding rounds according to the importance degree of the load, the acceptable outage frequency, and the like.
Preferably, the load shedding rounds are 5 rounds in total.
Preferably, in step S1, the total cut load of the virtual power plants in each area is counted, and the virtual power plants are ranked according to the load importance degree, the acceptable power failure frequency and the like, and then each round of action quantity set according to scheduling is divided into 5 rounds of action sequences respectively.
Preferably, in step S2, the fundamental frequency deviation amount of each virtual power plant installation point at the current moment is obtained according to the difference between the fundamental frequency of the voltage of the installation point obtained by monitoring and the fundamental standard frequency.
Preferably, step S3 further comprises:
step S300, for the virtual power plant belonging to the first round, if the obtained fundamental frequency deviation is between a first threshold and a third defense line action threshold or a low-cycle load shedding basic round starting threshold, and the duration exceeds a preset value, the low-frequency off-grid device acts to cut off a preset number of interruptible loads, otherwise, the low-frequency off-grid device is controlled to be not act;
step S301, for the virtual power plant belonging to the second round, if the obtained fundamental frequency deviation is between the second threshold and the third defending line action threshold or the low-cycle load shedding basic round starting threshold, and the duration exceeds the preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
step S302, for the virtual power plant belonging to the third round, if the obtained fundamental frequency deviation is between a third threshold and a third defending line action threshold or a low-cycle load shedding basic round starting threshold, and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
step S303, for the virtual power plant belonging to the fourth round, if the obtained fundamental frequency deviation is between the fourth threshold and the third defending line action threshold or the low-cycle load shedding basic wheel starting threshold, and the duration exceeds the preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
step S304, for the virtual power plant belonging to the fifth round, if the obtained fundamental frequency deviation is between the fifth threshold and the third defending line action threshold or the low-cycle load shedding basic round starting threshold, and the duration exceeds the preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated.
In order to achieve the above objective, the present invention further provides an automatic off-line control device with multi-zone coordination, including:
the wheel level dividing unit is used for dividing the virtual power plants in each area into different load cutting rounds according to the load importance degree, the acceptable power-off frequency and the like;
the fundamental wave frequency deviation amount acquisition unit is used for acquiring the voltage fundamental wave frequency of the installation point monitored by each virtual power plant in real time through the low-frequency off-grid device, and acquiring the fundamental wave frequency deviation amount of the current moment of the installation point of each virtual power plant according to the voltage fundamental wave frequency of the installation point monitored by each virtual power plant
And the control unit is used for restraining the action behavior classification of each virtual power plant according to the fundamental frequency deviation obtained by each virtual power plant and the wheel sequence of each virtual power plant.
Preferably, the control unit is configured to:
for the virtual power plant belonging to the first round, if the obtained fundamental frequency deviation is between a first threshold value and a third defense line action threshold value or a low-frequency load shedding basic round starting threshold value and the duration exceeds a preset value, the low-frequency off-grid device acts to cut off a preset number of interruptible loads, otherwise, the low-frequency off-grid device is controlled to be not act;
for the virtual power plant belonging to the second round, if the obtained fundamental frequency deviation is between a second threshold value and a third defense line action threshold value or a low-frequency load shedding basic round starting threshold value and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
for the virtual power plant belonging to the third round, if the obtained fundamental frequency deviation value is between a third threshold value and a third defense line action threshold value or a low-frequency load shedding basic wheel starting threshold value and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
for the virtual power plant belonging to the fourth round, if the obtained fundamental frequency deviation value is between a fourth threshold value and a third defense line action threshold value or a low-frequency load shedding basic wheel starting threshold value and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
for the virtual power plant belonging to the fifth round, if the obtained fundamental frequency deviation is between the fifth threshold and the third defending line action threshold or the low-frequency load shedding basic round starting threshold, and the duration exceeds a preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated.
Compared with the prior art, the multi-region coordinated automatic off-grid control strategy and device divide the virtual power plants in each region into different load shedding rounds, then each virtual power plant monitors the voltage fundamental frequency of the set point in real time through the low-frequency off-grid device, obtains the fundamental frequency deviation value of the set point at the current moment according to the monitored voltage fundamental frequency of the set point, and finally restrains the action behavior of each virtual power plant according to the fundamental frequency deviation value obtained by each virtual power plant and the wheel sequence of each virtual power plant.
Drawings
FIG. 1 is a flowchart illustrating steps of an automatic off-line control strategy with multi-zone coordination according to the present invention;
FIG. 2 is a system configuration diagram of an automatic off-line control device with multi-zone coordination according to the present invention;
FIG. 3 is a flow chart of an embodiment of the present invention.
Detailed Description
Other advantages and effects of the present invention will become readily apparent to those skilled in the art from the following disclosure, when considered in light of the accompanying drawings, by describing embodiments of the present invention with specific embodiments thereof. The invention may be practiced or carried out in other embodiments and details within the scope and range of equivalents of the various features and advantages of the invention.
Fig. 1 is a flowchart illustrating steps of an automatic off-line control strategy with multi-zone coordination according to the present invention. As shown in fig. 1, the multi-zone coordinated automatic off-line control strategy of the present invention comprises the following steps:
step S1, dividing the virtual power plants in each area into different load cutting rounds according to the load importance degree, acceptable power-off frequency and the like;
in the specific embodiment of the invention, the total cut load of the virtual power plants in each area is counted, the virtual power plants are sequenced according to the importance degree of the load, the acceptable power failure frequency and the like, and then each round of action quantity set according to scheduling is respectively divided into 5 rounds of action sequences.
And S2, each virtual power plant monitors the voltage fundamental frequency of the setting point in real time through the low-frequency off-grid device, and obtains the fundamental frequency deviation amount of the current moment of the setting point according to the monitored voltage fundamental frequency of the setting point.
In the specific embodiment of the invention, the fundamental frequency deviation of the set point k at the time t is obtained by adopting the following calculation formula:
wherein,to set the fundamental frequency deviation of the point k at the time t, f 0 For the fundamental standard frequency, typically 50Hz,the fundamental frequency of node k at time t is measured, i.e., the fundamental frequency of the voltage at the set point (node k) monitored by the low-frequency off-grid device at time t.
And S3, restraining the action behavior classification of each virtual power plant according to fundamental frequency deviation obtained by each virtual power plant and the wheel sequence of each virtual power plant.
In the present invention, the amount of motion per round is as P n (n=1 to 5) according to the scheduling requirementThe motion wheel level of each virtual power plant can be set and adjusted according to the importance degree of the load, so that the problem that the frequency of a new energy power system is possibly low in suspension is solved, the virtual power plants can be ensured to effectively participate in frequency modulation, benefits are earned, frequent motions of the virtual power plants are avoided, and normal work of the virtual power plants is influenced. Specifically, step S3 further includes:
step S300, for the virtual power plant belonging to the first round, if the obtained fundamental frequency deviation is between the first threshold (e.g. 0.5 Hz) and the third defense line action threshold (e.g. 1.0 Hz) or the low-cycle load shedding basic round starting threshold, and the duration exceeds a certain time constant value, e.g. 0.02S, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 1 (P 1 The value can be preset), otherwise, the low-frequency off-line device is controlled to be not operated;
step S301, for the virtual power plant belonging to the second round, if the obtained fundamental frequency deviation is between the second threshold (e.g. 0.6 Hz) and the third defense line action threshold (e.g. 1.0 Hz) or the low-cycle load shedding basic round starting threshold, and the duration exceeds a certain time constant value, e.g. 0.02S, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 2 (P 2 The value can be preset), otherwise, the low-frequency off-line device is controlled to be not operated;
step S302, for a virtual power plant belonging to a third round, if the obtained fundamental frequency deviation is between a third threshold (e.g. 0.7 Hz) and a third defense line action threshold (e.g. 1.0 Hz) or a low-cycle load shedding basic round starting threshold, and the duration exceeds a certain time constant value, e.g. 0.02S, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 3 (P 3 The value can be preset), otherwise, the low-frequency off-line device is controlled to be not operated;
step S303, for the virtual power plant belonging to the fourth round, if the obtained fundamental frequency deviation is between the fourth threshold (e.g. 0.8 Hz) and the third defense line action threshold (e.g. 1.0 Hz) or the low cycle load shedding basic wheel starting threshold, and the duration exceeds a certain time constant value, e.g. 0.02S, the low frequency off-grid device action cuts off a certain amount of interruptible load P 4 (P 4 A preset value), otherwise, the low-frequency de-coupling is controlledThe net device does not act;
step S304, for the virtual power plant belonging to the fifth round, if the obtained fundamental frequency deviation is between the fifth threshold (e.g. 0.9 Hz) and the third defense line action threshold (e.g. 1.0 Hz) or the low-cycle load shedding basic round starting threshold, the duration exceeds a certain time constant value, e.g. 0.02S, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 5 (P 5 The value can be preset), otherwise, the low-frequency off-line device is controlled to be not operated.
Fig. 2 is a system architecture diagram of an automatic off-line control device with multi-zone coordination according to the present invention. As shown in fig. 2, the present invention provides an automatic off-line control device with multi-zone coordination, which includes:
the wheel level dividing unit 201 is used for dividing the virtual power plants in each region into different load cutting rounds according to the load importance degree, the acceptable power failure frequency and the like;
in the embodiment of the present invention, the round-level dividing unit 201 counts the total cut load of the virtual power plant in each area, sorts the virtual cut load according to the load importance degree, the acceptable power-off frequency and the like, and then divides each round of motion according to the scheduling setting into 5 rounds of motion sequences.
The fundamental frequency deviation amount obtaining unit 202 is configured to obtain fundamental frequency of voltage at a setting point monitored by each virtual power plant in real time through the low-frequency off-grid device, and obtain a fundamental frequency deviation amount of the setting point of each virtual power plant at a current moment according to the fundamental frequency of voltage at the setting point monitored by each virtual power plant.
In the embodiment of the present invention, the fundamental frequency deviation amount acquisition unit 202 obtains the fundamental frequency deviation amount of each virtual power plant installation point k at the time t by using the following calculation formula:
wherein,to set the fundamental frequency deviation of the point k at the time t, f 0 For the fundamental standard frequency, typically 50Hz,the fundamental frequency of node k at time t is measured, i.e., the fundamental frequency of the voltage at the set point (node k) monitored by the low-frequency off-grid device at time t.
And the control unit 203 is used for restraining the action behavior classification of each virtual power plant according to the fundamental frequency deviation amount obtained by each virtual power plant and the wheel sequence of each virtual power plant.
In the present invention, the amount of motion per round is as P n (n=1-5) manually making and adjusting according to scheduling requirements, and setting and adjusting the action wheel level of each virtual power plant according to the importance degree of the load, so that the problem that the frequency of a new energy power system is possibly low in suspension is solved, the virtual power plants can be ensured to effectively participate in frequency modulation, benefit is earned, frequent actions are avoided, and normal work of the virtual power plants is influenced. Specifically, the control unit 203 specifically functions to:
for the virtual power plant belonging to the first round, if the obtained fundamental frequency deviation is between the first threshold (such as 0.5 Hz) and the third defending line action threshold (such as 1.0 Hz) or the low-cycle load shedding basic round starting threshold, and the duration exceeds a certain time fixed value such as 0.02s, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 1 Otherwise, the low-frequency off-line device is controlled to be not operated;
for the virtual power plant belonging to the second round, if the obtained fundamental frequency deviation is between the second threshold (such as 0.6 Hz) and the third defending line action threshold (such as 1.0 Hz) or the low-cycle load shedding basic round starting threshold, and the duration exceeds a certain time fixed value such as 0.02s, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 2 Otherwise, the low-frequency off-line device is controlled to be not operated;
for a virtual power plant belonging to a third cycle, if the obtained fundamental frequency deviation is between a third threshold (e.g. 0.7 Hz) and a third line of defense action threshold (e.g. 1.0 Hz) or a low cycle derate base cycle start threshold, and the duration exceeds a certain time constant, e.g. 0.02s, then the low frequency derateThe net device action cuts off a certain amount of interruptible load P 3 Otherwise, the low-frequency off-line device is controlled to be not operated;
for the virtual power plant belonging to the fourth round, if the obtained fundamental frequency deviation is between the fourth threshold (e.g. 0.8 Hz) and the third defending line action threshold (e.g. 1.0 Hz) or the low-cycle load shedding basic wheel starting threshold, and the duration exceeds a certain time constant value, such as 0.02s, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 4 Otherwise, the low-frequency off-line device is controlled to be not operated.
For the virtual power plant belonging to the fifth round, if the obtained fundamental frequency deviation is between the fifth threshold (such as 0.9 Hz) and the third defending line action threshold (such as 1.0 Hz) or the low-cycle load shedding basic round starting threshold value, the duration exceeds a certain time fixed value, such as 0.02s, the low-frequency off-grid device action cuts off a certain amount of interruptible load P 5 Otherwise, the low-frequency off-grid device is controlled to be not operated.
Examples
FIG. 3 is a flow chart of an embodiment of the present invention. In this embodiment, a multi-region coordinated automatic off-line control strategy includes the following steps:
step 1, counting total cut load quantity of virtual power plants in each area, sorting according to load importance degree, acceptable power-off frequency and the like, and dividing each round of action quantity set according to scheduling into 5 rounds of action sequences respectively;
step 2, each virtual power plant monitors the voltage fundamental frequency of the setting point in real time through a low-frequency off-grid device, calculates the fundamental frequency deviation amount, and the calculation formula is as follows
Wherein,to set the fundamental frequency deviation of the point k at the time t, f 0 For the fundamental standard frequency, typically 50Hz,is the fundamental frequency measurement of node k at time t.
Step 3: if the system frequency is lower than 49.5Hz but higher than 49.4Hz and the duration exceeds 0.02s, the virtual power plant in the first round of sequence acts to cut off a certain load amount (P is less than or equal to P) 1 )；
Step 4: if the system frequency is lower than 49.4Hz but higher than 49.3Hz and the duration exceeds 0.02s, the virtual power plant in the first and second round of sequences acts, and a certain load amount (less than or equal to P) is cut off 1 +P 2 )；
Step 5: if the system frequency is lower than 49.3Hz but higher than 49.2Hz and the duration exceeds 0.02s, the virtual power plant in the first, second and third-wheel sequences acts to cut off a certain load amount (less than or equal to P) 1 +P 2 +P 3 )；
Step 6: if the system frequency is lower than 49.2Hz but higher than 49.1Hz and the duration exceeds 0.02s, the virtual power plant in the first, second, third and fourth-wheel sequences acts to cut off a certain load amount (less than or equal to P) 1 +P 2 +P 3 +P 4 )；
Step 7: if the system frequency is lower than 49.1Hz but higher than 49Hz and the duration exceeds 0.02s, the virtual power plant in the first, second, third, fourth and fifth round of sequences acts to cut off a certain load amount (less than or equal to P) 1 +P 2 +P 3 +P 4 +P 5 )；
Step 8: in other cases, the low frequency load shedding device does not operate.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, the scope of the invention is to be indicated by the appended claims.
Claims (3)
1. An automatic off-line control strategy with multi-region coordination comprises the following steps:
step S1, dividing the virtual power plants in each area into different load shedding rounds;
step S2, each virtual power plant monitors the voltage fundamental frequency of the setting point in real time through a low-frequency off-grid device, and obtains the fundamental frequency deviation amount of the current moment of the setting point according to the monitored voltage fundamental frequency of the setting point;
step S3, restraining the action behavior classification of each virtual power plant according to fundamental frequency deviation obtained by each virtual power plant and the wheel sequence of each virtual power plant;
in the step S1, dividing the virtual power plants in each area into different load cutting rounds according to the load importance degree, the acceptable power-off frequency and the like;
the load cutting round is 5 rounds in total;
in step S1, the total cut load quantity of the virtual power plants in each area is counted, and the virtual power plants are sequenced according to the load importance degree, the acceptable power-off frequency and the like, and then each round of action quantity set according to scheduling is divided into 5 rounds of action sequences respectively;
step S3 further comprises:
step S300, for the virtual power plant belonging to the first round, if the obtained fundamental frequency deviation is between a first threshold and a third defense line action threshold or a low-cycle load shedding basic round starting threshold, and the duration exceeds a preset value, the low-frequency off-grid device acts to cut off a preset number of interruptible loads, otherwise, the low-frequency off-grid device is controlled to be not act;
step S301, for the virtual power plant belonging to the second round, if the obtained fundamental frequency deviation is between the second threshold and the third defending line action threshold or the low-cycle load shedding basic round starting threshold, and the duration exceeds the preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
step S302, for the virtual power plant belonging to the third round, if the obtained fundamental frequency deviation is between a third threshold and a third defending line action threshold or a low-cycle load shedding basic round starting threshold, and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
step S303, for the virtual power plant belonging to the fourth round, if the obtained fundamental frequency deviation is between the fourth threshold and the third defending line action threshold or the low-cycle load shedding basic wheel starting threshold, and the duration exceeds the preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
step S304, for the virtual power plant belonging to the fifth round, if the obtained fundamental frequency deviation is between the fifth threshold and the third defending line action threshold or the low-cycle load shedding basic round starting threshold, and the duration exceeds the preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated.
2. The multi-zone coordinated automatic off-line control strategy of claim 1, wherein: in step S2, the fundamental frequency deviation amount of each virtual power plant installation point at the current moment is obtained according to the difference value between the fundamental frequency of the voltage of the installation point obtained through monitoring and the fundamental standard frequency.
3. An automatic off-line control device with multi-zone coordination, comprising:
the wheel level dividing unit is used for dividing the virtual power plants in each area into different load cutting rounds according to the load importance degree, the acceptable power-off frequency and the like;
the fundamental wave frequency deviation amount acquisition unit is used for acquiring voltage fundamental wave frequency of the setting points monitored by the virtual power plants in real time through the low-frequency off-grid device, and acquiring fundamental wave frequency deviation amount of the setting points of the virtual power plants at the current moment according to the voltage fundamental wave frequency of the setting points monitored by the virtual power plants;
the control unit is used for restraining the action behavior classification of each virtual power plant according to the fundamental frequency deviation value obtained by each virtual power plant and the wheel sequence of each virtual power plant;
the control unit is used for:
for the virtual power plant belonging to the first round, if the obtained fundamental frequency deviation is between a first threshold value and a third defense line action threshold value or a low-frequency load shedding basic round starting threshold value and the duration exceeds a preset value, the low-frequency off-grid device acts to cut off a preset number of interruptible loads, otherwise, the low-frequency off-grid device is controlled to be not act;
for the virtual power plant belonging to the second round, if the obtained fundamental frequency deviation is between a second threshold value and a third defense line action threshold value or a low-frequency load shedding basic round starting threshold value and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
for the virtual power plant belonging to the third round, if the obtained fundamental frequency deviation value is between a third threshold value and a third defense line action threshold value or a low-frequency load shedding basic wheel starting threshold value and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
for the virtual power plant belonging to the fourth round, if the obtained fundamental frequency deviation value is between a fourth threshold value and a third defense line action threshold value or a low-frequency load shedding basic wheel starting threshold value and the duration exceeds a preset value, cutting off a preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated;
for the virtual power plant belonging to the fifth round, if the obtained fundamental frequency deviation is between the fifth threshold and the third defending line action threshold or the low-frequency load shedding basic round starting threshold, and the duration exceeds a preset value, cutting off the preset number of interruptible loads, otherwise, controlling the low-frequency off-grid device to be not operated.
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